Can horses eat grass stickers

This depends on what you mean by 'stickers'. If you mean the soft sticky seeds that cling to your legs after walking through tall grass or the soft ball like seeds with tiny spines found in certain species of grass they are OK and horses eat them all the time. If you are referring to what are often called ' Sand spurs or sand stickers' then absolutely not. These hard brown seeds can and will get stuck to the horses mouth, tongue, gums and esophagus and cause pain which will require a equine veterinarian to come out and remove them.